- Raise and support the vehicle safely.
- Disconnect the wheel speed sensor electrical harness.
- Check for AC voltage between the sensor terminals while turning the wheels. If AC voltage is not detected, the sensor is faulty.
- Use an ohmmeter to measure resistance between the pins of the sensor. Correct resistance should be 1275-1495 ohms for front sensors and 1260-1540 ohms for rear sensors.
- If resistance is not within specification, the sensor is faulty.
- With the ohmmeter still connected, manipulate and pull gently on the cable, trying to expose a hidden break in the line. Do not use excess force. Be suspicious of areas where the cable bends or turns during routing.
- Lower the vehicle.
REMOVAL & INSTALLATION
See Figure 1
- Raise and safely support the vehicle.
- Remove the wheel and tire.
- Remove the inner fender or splash shield as required.
- Beginning at the sensor end, carefully disconnect or release each clip and retainer along the sensor wire. Take careful note of the exact position of each clip; they must be reinstalled in the identical position.
- Disconnect the sensor connector at the end of the harness.
- Remove the bolt holding the speed sensor bracket to the knuckle and remove the assembly from the vehicle.
The speed sensor has a pole piece projecting from it. This exposed tip must be protected from impact or scratches. Do not allow the pole piece to contact the toothed wheel during removal or installation.
- Remove the sensor from the bracket.
- Assemble the sensor onto the bracket and tighten the bolt to 5-8 ft. lbs. (7-11 Nm) on front sensors and 12-19 ft. lbs. (17-25 Nm) on rear sensors.
- Route the cable correctly and loosely install the clips and retainers. All clips must be in their original position and the sensor cable must not be twisted. Improper installation may cause cable damage and system failure.
The wiring in the harness is easily damaged by twisting and flexing.
- Tighten the screws and bolts for the cable retaining clips.
- Install the inner fender or splash shield, if removed.
- Install the wheel and tire. Lower the vehicle to the ground.